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Heat capacity of |
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| Authors: | V. A. Drebushchak Yulia A. Kovalevskaya I. E. Paukov Elena V. Boldyreva |
| Affiliation: | (1) REC-008 ‘Molecular Design and Ecologically Safe Technologies’, Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia;(2) Institute of Geology and Mineralogy, SB RAS, pr. Ac. Koptyuga 3, Novosibirsk, 630090, Russia;(3) Institute of Inorganic Chemistry, SB RAS, pr. Ac. Lavrentieva 3, Novosibirsk, 630090, Russia;(4) Institute of Solid State Chemistry and Mechanochemistry, SB RAS, ul. Kutateladze 18, Novosibirsk, 630128, Russia |
| Abstract: | Heat capacity of D- and DL-serine was measured using adiabatic calorimetry in a temperature range of 5.5 to 300 K, and then thermodynamic functions were calculated. The difference in heat capacity (C PD-C PDL) between two species indicates a small anomaly in D-serine near 15 K and a systematic excess over DL for temperatures > 30 K. This is much larger, than a difference in thermodynamic functions measured so far for the polymorphs of organic molecular crystals. The excess is fitted well to Einstein contribution with characteristic temperature of 185 K which is equivalent to vibrational mode at 129 cm−1. |
| Keywords: | adiabatic calorimetry enantimorph heat capacity molecular crystals racemate serine |
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